Saving and Loading settings by NSUserDefault on UIswitches Xcode - iphone

Question

I have a settings view where i have provided the option for users to change their settings.
Settings view have a table view having 2 UISwitches. I need help with NSUserdefaults method for saving states, and how I can write the code to load my values.
Here is my code so far
In `cellForRowAtIndexPath` method:
[cell.switchButton addTarget:self action:#selector(switchButtonTapped:) forControlEvents:UIControlEventValueChanged];
[[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:#"myBool"];
BOOL hBool = [[ NSUserDefaults standardUserDefaults] boolForKey:#"myBool"];
NSLog(#"tag %i", tappedSwitch.tag);
if (cell.switchButton.tag == 0) {
[cell.switchButton setOn:hBool];
}
return cell;
}
- (void) switchButtonTapped: (id) sender {
tappedSwitch = (UISwitch *) sender;
switch (tappedSwitch.tag) {
case 0:
passcodeSwitchIsOn = tappedSwitch.isOn;
if (passcodeSwitchIsOn) {
GCPINViewController *PIN = [[GCPINViewController alloc]
initWithNibName:nil
bundle:nil
mode:GCPINViewControllerModeCreate];
PIN.messageText = #"Enter a passcode";
PIN.errorText = #"The passcodes do not match";
PIN.title = #"Set Passcode";
PIN.verifyBlock = ^(NSString *code) {
NSLog(#"setting code: %#", code);
code = saveString;
return YES;
};
[PIN presentFromViewController:self animated:YES];
[PIN release];
// method of saving
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:passcodeSwitchIsOn forKey:#"myBool"];
[defaults synchronize];
}
break;
case 1:
bluetoothSwitchIsOn = tappedSwitch.isOn;
if (bluetoothSwitchIsOn) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Bluetooth Switch" message:#"Bluetooth Switch is ON" delegate:self cancelButtonTitle:#"Okay" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
default:
break;
}
[settingsTable reloadData];
}

Answer 1

Create a reference to your user defaults:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
Set a value:
[defaults setBool:1 forKey:#"bluetooth"];
You can set this back to 0 when bluetooth is off:
[defaults setBool:0 forKey:#"bluetooth"];
The user default is identified by the string of your choice. In this case: #"bluetooth". The value for the default will be nil until you create it and set it to something else.
So you can say:
if (!bluetooth) // bluetooth is off
else // bluetooth is on
https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html

Answer 2

This can be used for handling your issue.
IBOutlet UISwitch * swi_yourswitch;
#property(nonatomic,retain) UISwitch * swi_yourswitch;
implimentation
#synthesise swi_yourswitch;
- (void) switchButtonTapped: (id) sender {
UISwitch * switchObj = (UISwitch*)sender;
if(switchObj == self.swi_yourswitch){
if (self.swi_yourswitch.on){
NSLog(#"On");
}
else{
NSLog(#"Off");
[self.swi_yourswitch setOn:0];
}
}
To store value
[[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:#"mybool"];
[[NSUserDefaults standardUserDefaults] synchronize];
To get stored value
[NSUserDefaults standardUserDefaults] valueForKey:#"mybool"]